#include<iostream>
#include<string>
using namespace std;

int main(){
    string s1;
    getline(cin,s1);
    for(auto it=s1.begin();it<s1.end();it++){
		if(*it=='a') *it='z';
		else if(*it=='A') *it='Z';
        else if((*it<='z'&& *it>='b')||(*it<='Z'&& *it>='B')){
           *it=*it-1;
        } 
        cout<<*it;
    }
    return 0;
}
